Add Postmark on the add-on page or run in the command line:$heroku addons:add postmark:test

Follow the documentation to get started.

Once the Postmark add-on is installed, you will be able to send 10,000 emails for free each month through your Heroku application. During the beta, you will not be able to send more than 10,000 emails per month. Once the add-on is out of beta, we will announce the pricing plans on Heroku that will take effect once you exceed the 10,000 limit.

If you use Heroku, or want to, we’d love your help testing the new add-on. Let us know what you think or if you need help getting started.